1 NSMutableURLRequest请求时，会找到和该域名相同的cookie值，放到一起，然后请求。

2 [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie]; 不会在本地磁盘写入，只做内存缓存。

3 添加cookie

 NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
    [cookieProperties setObject:@"authKey" forKey:NSHTTPCookieName];
    [cookieProperties setObject:@".tabobao.com" forKey:NSHTTPCookieDomain];
    [cookieProperties setObject:@"sfda" forKey:NSHTTPCookieValue];
    [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
    [cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];

    NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
    
    //添加cookie
    NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    for (NSHTTPCookie *tempCookie in cookies) {
        NSLog(@"tep %@",tempCookie);
    }

4 遍历cookie

  NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    for (NSHTTPCookie *tempCookie in cookies) {
        NSLog(@"tep %@",tempCookie);
    }

5 删除cookie

  for (NSHTTPCookie *curCookie in [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies]) {
        [[NSHTTPCookieStorage sharedHTTPCookieStorage] deleteCookie:curCookie];
    }

6测试代码

- (void)viewDidLoad {
    [super viewDidLoad];
    [self writeCookie];
    [self testquest];
}
- (void)writeCookie{
    NSMutableDictionary *cookieProperties = [NSMutableDictionary dictionary];
    [cookieProperties setObject:@"authKey" forKey:NSHTTPCookieName];
    [cookieProperties setObject:@".taobao.com" forKey:NSHTTPCookieDomain];
    [cookieProperties setObject:@"sfda" forKey:NSHTTPCookieValue];
    [cookieProperties setObject:@"/" forKey:NSHTTPCookiePath];
    [cookieProperties setObject:@"0" forKey:NSHTTPCookieVersion];

    //添加cookie
    NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:cookieProperties];
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
    
    NSArray *cookies = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
    for (NSHTTPCookie *tempCookie in cookies) {
        NSLog(@"tep %@",tempCookie);
    }

    
}
- (long long)testquest{
    NSString *nsUrl = [NSString stringWithFormat:@"https://taobao.com"];
    NSMutableURLRequest *nsmRequest = [[NSMutableURLRequest alloc] init] ;
    [nsmRequest setURL:[NSURL URLWithString:nsUrl]];
    [nsmRequest setHTTPMethod:@"HEAD"];
    [nsmRequest setTimeoutInterval:30];
    [nsmRequest addValue:[NSString stringWithFormat:@"text/html"] forHTTPHeaderField: @"Content-Type"];
    [nsmRequest addValue:[NSString stringWithFormat:@"no-cache"] forHTTPHeaderField: @"Cache-Control"];
    
    //get response
    NSHTTPURLResponse* nsResponse = nil;
    NSError *nsError = nil;
    NSData *nsResponseData = nil;
    
    @try
    {
        nsResponseData = [NSURLConnection sendSynchronousRequest:nsmRequest returningResponse:&nsResponse error:&nsError];
    }
    @catch (NSException * e)
    {
        return 0;
    }
    
    
    if( nsResponseData == nil )
    {
        if( -1001 == [nsError code] )
        {
            return 0;
        }
        
        
        return 0;
    }
}

赋值代码后，使用Charles抓包就好。